I have two Macs, a G5 tower and a Macbook Pro. I want to backup the Macbook Pro to an external hard drive on the G5 tower via Time Machine.
I know there is a way to do this; my friend has his setup exactly like I want it.
I tried FTP sharing the backup drive on the G5 and trying to connect to it on the Macbook Pro. The G5 is running 10.5.8 and the Macbook Pro 10.6.8.
81 Answer
Sharing a Time Machine volume over the network only works reliably with Apple Filing Protocol (AFP). If you use Leopard (10.5.8) or later, that should be no problem. On earlier versions, some hacking is required.
Share your drive over Sharing Preferences → File Sharing. Under "Options", enable AFP sharing.
There's also a video tutorial on the very same subject.